JPH03126556A - Bagging package - Google Patents

Abstract

PURPOSE:To obtain a package having excellent pinhole resistance, shock resistance, flexibility and transparency by using a composite film in which a polyamide resin layer, a resin for bonding as a cushioning material layer, a polyamide resin layer, a resin layer for bonding and a sealant resin layer are laminated in the order from the outside. CONSTITUTION:A composite film in which a polyamide resin layer A, a resin layer B for bonding as a cushioning material layer, a polyamide resin layer C, a resin layer D for bonding and a sealant resin layer E are laminated in the order from the outside is employed. Nylon 6 is proper as the resin layer A and the copolymer, etc., of nylon 6 and nylon 6-6 as the resin layer C. A monobasic unsaturated fatty acid or an acid modified olefin resin is used as the resin layers B and D. An olefin resin and an ethylene copolymer can be used as the resin layer E.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention uses a multilayer composite film with excellent pinhole resistance, impact strength, flexibility, transparency, etc. This invention relates to a bag-filled package packaged using a filling type packaging machine.

[Conventional technology]

During the distribution process, food products are susceptible to quality deterioration due to various alterations such as loss of shape, color, taste, and aroma due to temperature, moisture, oxygen, light, etc., and microorganisms such as bacteria and mold. Conventionally, additives such as preservatives and antioxidants have been added directly to food to preserve it without deteriorating its quality until it reaches the consumer's mouth.

However, in recent years, regulations on additives to food have become stricter in the food processing industry, particularly in the meat processing and fish processing fields, and the amount of additives used has been reduced or even stopped altogether. In order to ensure long-term shelf life and freshness of products, it has become necessary to develop films that provide packaging materials with functionality such as oxygen gas barrier properties.

For example, when packaging processed meat products such as hams and sausages, the contents are amorphous and produce meat juices, so vacuum packaging allows the packaging material to fit around the contents and improve the appearance. At the same time, it is necessary to prevent the generation of meat juice by leaving no space between the contents and the packaging material.

Furthermore, polyolefin films such as polyethylene and polypropylene, as well as films made of polyvinyl chloride, which have traditionally been used for food packaging, may suffer from mechanical strength problems such as pinholes during the transportation stage of the food distribution process, depending on the transportation method. There was a problem.

We believe that a method to satisfy all of the above requirements would be to create a packaging film with a laminated structure of several layers, distributing various functions to each layer, and making it have many functions overall. It will be done.

On the other hand, in recent years, there has been a movement among food manufacturers to rationalize their production processes, both in terms of personnel and equipment, and in packaging machinery, there are many bag-filling and packaging machines such as billow-type packaging machines for the purpose of speeding up and automation. It has come to be used. Depending on the packaging machine, the time required for heat sealing is naturally shortened because the product flows at high speed, so the characteristics required of the packaging material include good heat sealability and good compatibility with the packaging machine. That is the point.

C Problems to be Solved by the Invention] The object of the present invention is to provide a bag making and filling type packaging machine such as a pillow type packaging machine, which has excellent pinhole resistance, impact strength, flexibility, transparency, etc. An object of the present invention is to provide a bag-filled package made of a multilayer composite film.

[Means to solve the problem]

From the outside, the present invention consists of polyamide resin J! J (A),
Adhesive resin layer (B) serving as a cushioning material layer, polyamide resin layer (C), adhesive resin layer (D), sealant resin Jiff
The present invention relates to a bagged package using composite films laminated in the order shown in (E).

The outermost polyamide resin layer used in the present invention (
A) is nylon 6, nylon 12, nylon 11, nylon 6- produced by polycondensation reaction of ω-aminocarboxylic acid, polycondensation reaction of tribasic acid and diamine, etc.
6, nylon 6-10, nylon 6-12, amorphous nylon, and copolymers or blends thereof.

In particular, nylon 6 is most suitable because it has good mechanical suitability (for example, slipperiness) with a row-type packaging machine, but it is also possible to blend an appropriate amount of a suitable slip agent. Also,
For applications requiring heat sterilization treatment at least at 80° C. for 110 minutes or longer, nylon 6 is still preferable because there is no fusion (blocking) between the nylons in the outer layer.

The intermediate polyamide resin layer (C) also contains nylon 6, nylon 12, nylon 11, and nylon 6- as in (A).
6, nylon 6-10, nylon 6-12, amorphous nylon, and copolymers or blends thereof. Among them, a copolymer of nylon 6 and nylon 66 is considered suitable from the viewpoint of imparting flexibility and strength against puncture from the inside.

The adhesive resin layers (B) and (D) are made of ethylene-vinyl acetate copolymer or ethylene-propylene elastomer, and monobasic unsaturated fatty acids such as acrylic acid and methacrylic acid, or maleic acid, fumaric acid, and itacon. An acid-modified olefin resin obtained by chemically bonding an anhydride of a dibasic unsaturated fatty acid such as an acid, ie, maleic anhydride, is used. (B) layer consists of (A) and (C)
By inserting it between both nylon layers, it acts as a cushioning layer and has been found to significantly improve pinhole resistance.

Sealant resin Ji (E) is LDPESL, LDP
E, Olefin resins such as MDPE, HDPE, and PP, and EVA which is an ethylene copolymer, ethylene-methylmethacrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene- Resins such as ethyl acrylate-maleic anhydride copolymer, ethylene-acrylic acid copolymer, ethylene-meccrylic acid copolymer, and ION can be used. An appropriate amount of a suitable lubricant may be added to improve mechanical compatibility with a billow packaging machine or the like.

The total thickness of the multilayer composite film of the present invention is 10 to 150 μm
A plastic film having a thickness within this range is suitable as a packaging film for use in food packaging such as billow packaging.

As a method for manufacturing the multilayer stretched film of the present invention, known methods such as coextrusion using a plurality of extruders, melt extrusion lamination, dry lamination, etc. are used.

The bag packaging forms of the present invention include three-side seal type, envelope type, central palm seal type, pleated line type (gusset bag), flat bottom type, square bottom type (pleased), self-supporting bag (toy bag), etc. be. In addition, as a packaging method, automatic packaging using a make-and-fill packaging machine such as a pillow-type packaging machine and manual packaging are used.

[Examples] (Examples 1 to 3) Table 1 shows examples and comparative examples of the present invention. The film is made by coextrusion or dry lamination.
A μm thick film was produced.

Using each film, roasted pork, which is an amorphous processed meat product with protrusions weighing 200 g in weight, was vacuum-packed using a horizontal pillow-type bag making and packaging machine, and the resulting package was A packaged sample was prepared by heating in hot water at 100°C for 20 minutes.

The evaluation method for the packaging material was to check its mechanical suitability with a horizontal pillow-type bag making and packaging machine, and to compare the packaging sample with a cardboard box (size: 300mm).
20 pieces in 1 x 300 x 200 mm) from a height of 1 m
After dropping the product 50 times, we checked to see if there was any damage to the seal, pinholes, etc.

The film of the present invention has excellent mechanical compatibility with packaging machines, and the drop test results of the package showed better results than the package made of the film of the comparative example.

Table 6-Ny: Nylon 6 (manufactured by Ube Industries ■ 1030B) 6
・66-Ny: Copolymer of nylon 6 and nylon 6-6 (5033B manufactured by Ube Industries) 5-12-Ny: Nylon 6-12 (manufactured by Ube Industries ■)
7024B) 6-Ny+a-Ny: Blend of nylon 6 and amorphous nylon (Sealer PA3426 manufactured by Mikata DuPont Polychemical ■) △:
Adhesive resin layer (Atomer NF-5 manufactured by Mitsui Petrochemicals)
00) Δ: : Adhesive resin N (manufactured by Tosoh ■ Mersen
P2O30W) △3: Adhesive layer LLDPE: Linear low-density polyethylene (Mitsui Petrochemical ■ Ultzex 2022L) EVA:
Ethylene-vinyl acetate copolymer (Evaflex V-340 manufactured by Mikata DuPont Polychemicals) ION near ionomer (Himilan 1652 manufactured by Mikata DuPont Polychemicals ■) OPP: Stretched polypropylene PE: Polyethylene PVC: Vinyl chloride [Effects of the invention] The bagging package made of the multilayer composite film according to the present invention is
It has excellent pinhole resistance, impact strength, transparency, etc., and if the contents of, for example, bronc ham are packaged using a packaging machine such as a pillow-type packaging machine, it becomes an extremely superior package. .

Claims (1)

[Claims] (1) From the outside, in the following order: polyamide resin layer (A), adhesive resin layer (B) that will become a cushioning layer, polyamide resin layer (C), adhesive resin layer (D), and sealant resin layer (E). Bagged packaging using laminated composite films.